The issue I have is that more often than not, after the GRUB-select screen I get a black screen, and three times total white lines (kind of) flashes very quickly (with maybe 5 seconds between each flash). I'm not even able to get to the login-screen (nor the Xubuntu loading screen).

At first I thought it was simply me having installed something dumb or messed up some settings, but even after reformatting the partition and installing ubuntu again, the problem remains.

Before I formatted it xfce4's window manager wouldn't start either, but it does now (when I am able to see anything).

I can access the virtual console with Ctrl + Alt + F1, but I can't see anything. I've managed to shutdown the computer by using sudo shutdown -h now

Huh, now the xubuntu loading screen actually shows up (where before there were just a flash of lines), and if I erase the "splash" option in boot I'll instead see a bunch of text rows. The issue remains though, since after that the screen turns black again, now without any flashes (so just a single flash, but where I actually see xubuntu loading).
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Jona EkenbergOct 30 '12 at 10:32